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Finding the Fourth Proportional to 680, 1,019.60 and 371.32

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Solution

The fourth proportional to 680, 1,019.60 and 371.32 is: 556.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    680 : 1,019.60 = 371.32 : x
  2. Step 2: Convert to fraction form
    680/1,019.60 = 371.32/x
  3. Step 3: Cross multiply
    680x = 1,019.60 × 371.32
  4. Step 4: Simplify right side
    680x = 378,597.87
  5. Step 5: Solve for x
    x = 378,597.87/680
  6. Step 6: Final answer
    x = 556.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.